Nail-driving attachment for pneumatic hammers



"22 1927. Feb c. o. DICK NAIL DRIVING ATTACHMENT FOR PNEUMATICI HAMMERS Filed March 12, 1926 2 Sheets-Sheet l v W .M5

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22 1927'. Feb c. o. DICK NAIL DRIVING ATTACHMENT FOR PNEUMATIC Humans Filed March 12, 1925 2 Sheets-Sheet 2 lira-.f1 l

IN VEN TOR.

BY C ATTORNEY Patented Feb. 22, 1927. p

c'imRLEs o. mex, or GLnNwooD,

IOWA, ASSIGNOB F ONE-HALF TO CI'FIIEOI'D SAAB,

. Ol" GLENWOOD, IOWA.

NAIL-DRIVING ATTACHMENT iron rNEUMArIc Humans.

Applicationled latch 12, 1926. Serial 170.94303.

My invention` relate's broadly to pneu- 'natic hammers'and more particularly to a iail driving attachment for pneumatic hammers.

One of the ob'ects of my invention is to provide a simplified construction of nail driving attachment lfor pneumatic hammers, whereby the attachment may be applied to standard constructions of pneumatic hamv mers for the driving of nails in expediting building construction.

Another object of my invention is to rovide-a simplified construction of nail riving attachment for neumatic hammers in l5 which the delivery o nails to adriving head may be-timed automatically withthe application of the tool to the work.

Still another object of my invention is to provide a nail driving attachment for pneumatic hammers in which an automatic feed device is arranged to deliver to Ithe head of the tool a nail to be driven at each time that the tool is presented to the work.

Still another object of my invention is to provide a timing mechanism for a nail driving apparatus by'which successive feeding and delivery of nails may be secured automatically with the application of the tool to the work.

A further object of my invention is to provide a simplified construction and arrangement of parts for the automatic delivery and driving of nails under control of an operator for saving time and labor in the driving l5 of nails.

A still further object of my invention is to provide a nail driving. attachment for pneumatic hammers wherein an adJustab'le nail feeding hopper is provided by which 0 the angular position of the hopper with respect to the axis of the barrel may be changed to permit the tool to be interchangeably used in either a vertical or horizontal position. l 5 Other and further objects of my invention will be understood from the following speci-- cation by reference to the accompanying drawings, wherein: n

Figure 1 is a side elevation of a pneumatic i hammer illustrating the application of the attachment device of my invention and showing parts of the attachment broken away and in cross-section; Fig. 2 is a to yplan view showing the arrangements o parts of the pneumatic hammer and the nail driving attachment connected therewith; Fig. 3 is a detailed view illustrating a portion of the operating mechanism for insur- 'ing the delivery of nails to the pneumatic hammer; Fig. 4 is a longitudinal cross-section view of the barrel of the nail driving attachment showing the attachment in position ready to receive nails from the feeding mechanism; Fig. 5 is a cross-sectional view similar to the view illustrated in Fig. 4 showing the spring mechanism within the b arrel of the ,nail driving attachment partially contracted during the application of the tool to the work; Fi 6 is a cross-sectional view through the arrel of the nail driving attachment taken on line 6-6 oi Fig. 4; Figs. 7, 8 and 9 are views of the nail feeding mechanism; Figs. 10, 11 and 12 are views illustrating the several positions of the nail deliver device during the operation of the tool; an Fig. 13 is a perspective view of the nail delivery device.

Referring to erence character 1 designates the pneumatic h ammer as a Whole which is supplied with air pressure from any suitable source through any suitable hose which has not been illustrated. Reference character 2 designates the handle of the pneumatic hammer having barrel 3. housing 4 comprising the nail driving attachment extends over the pneumatic hammer 3 and is secured thereto by means of bolts 6 which pass through lug members 5 on the barrel 4 as indicated at 7. The nail driving attachment 4 is thus removably secured over the barrel 3 and may be tightenefthereover by means of the bolts 6. The nail driving attachmentincludes a tubular sleeve 8 with a conica-l head 9 for applcation to the work. able the sleeve 8 to be maintained in a given plane along the length of the barrel 3, the screws 10 projecting into slots 11 formed in the attachment 4. he sleeve 8 has an internal tubular portion 12 therein withl a supporting spider 13 at the inner end thereof slidable in slots 14 in the attachment 4. The tube 12 forms a cylinder in which the driving head 15 reciprocates as a. plunger. The driving head 15 is enlarged at 16 and fits into the head of the pneumatic hammer as at 17. A washer member 18 is secured over the plunger 15 in abutment with collar 16 for confining spring 19, the opposite end of which abuts against the arms of the drawings in detail, refuide screws 10 en;V

the spider 13. An angularly disposed tubular sleeve member is provided in connection with one side of the tube 12 and to this extension a flexible tube 22 is secured which connects with the metallic T member 23. The 23 terminates ina tunnel shaped inlet 24 and has a flap valve 25 located at its center. Flexible tube 26 extends from the T section 23 to the tube 27 having valve 28 interposed therein. The tube 27- connects with the main source of air pressure which supplies the pneumatic hammer enabling pressure to be established in the mechanism of the nail driving attachment. The valve- 28 is provided with a swivel control member 29 which is engaged on opposite sides by arms 30 which project from the longitudinally extending rod member 31. The rod member 31 is pivotally secured at 33 to the sleeve 8 and 1s guided through guide lugs 32 in the body portion 4 of the nail driving attachment enabling reciprocatory movement of the control rod 31 to be obtained. The casing or body portion 4 of the nail driving' attachment is provided with a laterally extending pivotal stud 35 which has a nut 36 secured thereon or clamping an arm 37 in position with respect to the nail driving attachment. The arm 37 forms a support for nail hopper 38 which is held in position by a member 39 carried by the lug 40 on the casing 4. The stud 35 has a cam member 41 thereon with a diametrically reduced portion 42 and a notch 43 thereon. A lug 44 carriedby eoacting member 45 is secured on the stud 35 in such manner that spring 47 secured between the lug eatension 46 on the coacting member 45 and a point 48 on the casing 4 tends to urge the flat face of the cam into contact with the longitudinally extending rod member 31. The coacting member is provided with a substantially round face 49 and a substantially flat face 50. The movement of rod member 31 is restrained b means of spring 51 which may contact wit the end of lever 52. The lever 52 is Jivoted at 53 to the pneumatic hammer an( is provided with an extension 75, the end ot which contacts with the head of the supply valve 54 for depressing the said valve.

The nail hopper 38 is provided with side portions 55 which terminate in Guides on opositeI sides of a longitudinally extending inclined slot .56 down which nails a, b and c may slide in vertically depending positions. The nail discharge organization comprises a bell crank 57 pivoted at 58 and spring pressed as at 59. The bell crank 57 is pivotally connected at 60 with a nail delivery device 61 which is shown more clearly in perspective view in Fi 13. The nait delivery device 61 is providd with arms 62, 63, amd64, the arm 63 being bent outwardly and terminating past the end of arm 64 and conical nose ot the tool spaced therefrom to receive a nail by gripping the nail beneath the head thereof as represented inthe drawings.

In Fig. 10 I have shown the normal position of the nail delivery device where the nails a, b and c are prevented from sliding down the inclined slot 56 by reason of the fact that the heads cl of the nails engage opposite sides 55 of the slot 56 and normally ride against the abutment olered by arm 64, of the delivery device 61.

In Fig. 11, however; I have shown the nail delivery device moving over in such position that the nail c is gripped between the arms 63 and 64. In Fig. 12 continued movement of the nail delivery device is shown where the coaction of the sides 55 ot slot 56 and arms 63 and 64 has entirely released-the nail c from support leaving the nail free to drop into the tunnel 24 of the nail feeding mechanism. The delivery ot the nail into the tunnel 24 is timed in such manner that at this instance flap valve 25 is closed in Afull line position represented in 'Fig l, permitting the nail to drop in the dotted line position with the tube 22. Further timing of the air supply results in the opening of Hap 25 leaving a i'ree passage for compressed air from tube 26 through tube 22 for blowing a nail into the tubular driving head 12 after which the plunger 15 operates against the head d ot the nail for driving the nail into the work.

The coaction of parts of the mechanism will be further understood when it is considered that the operator first presses the against the Work. This results in the sleeve 8 riding back over the casing 4' being guided exteriorly by screw members 10, riding in slots 11I and interiorly by means ot the arms of the spider 13 riding in the slots 14 in the tubular casing 4. The sleeve 8 moves back over the barrel of the pneumatic hammer against the action ot spring 19 and in this backward movement rod 31 is forced backwardly in such manner that spring 51 engages the end of the lever 52. The lug 34 engages the cani 45 moving leg 44 which in turn rotates thc cam 4l rcciprocating the bell crank 57. B v this operation a nail is deposited in the funnel 24. Upon continued movenient ot the rod inember 3l spring 51 forces lever 52 to such a position that valve 54 is opened allowing air pressure to be fed to the pneumatic hammer and to be supplied through tubular ineinber 27. Movement of rod 31 has at this time caused the openingr of valve 28 by reason ot the coaction between lug members 30 and arm 29 of the val-ve. Air is thus supplied under pressure through tube 26 opening valve 25 and blowing the nail which has dropped down the throat of funnel 24 into a position within the tubular member 12 where the plunger head l5 operates under to permit the tool to be used in either aI -ver' tical or horizontal nailing position. Byl changing the position of the nail hopper with respect to the body of the tool an operator may work with the tool in a vertical position, as for example,in'thelathing o'f a ceilingor by xin the hop r inthe position illustrated in igs.I 1 an 2. of the drawings, the tool may be readily used in a. horizontal position. f

matic 4central nail -catory motiony of said s While I have described inventionv in.

certain preferred embodiments, I- desire that it be understood that modifications 1nV the construction and arrangement of pats'of the tool may be made and that no limitations rupon the invention are intended other` than those i claims.

What I claim and desire tjo. secure by Letters Patent of the United States is as follows:

1. A-nail driving attachment for pneuhammers comprising -a supporting structureadapted to'be secured over a pneumatic hammer, a reciprocatory sleeve carried by said su porting structure and arranged to envelope t e drivlng head of said pneumatic hammer, a central-'nail guide internally positioned insaid reciprocatory s1eevea nail feeding hopper carrled by said'supporting structure, a nail'deli'very conduit extending between said nail feeding hopper and the guide of said 'reciprocatory sleeve,` and a common actuator arranged to be moved simultaneousl with the reciproeeve for effecting a selection and delivery of a nail fromsaid nail feeding hopper to said nail delivery uently causin a supply of-compresse'd air to be delivere to said posed by the scope ofthe appended nail delivery conduit for blowing nails suc-- cessively tosaid central nail guide for the driving operation of said pneumatic hammer.

matic said rod for admitting said nail delivery conduit for blowing nails to a position in said central nail nail driving attachment for pneuhammers comprlsmgv a supportmg structure adapted to be matic hammer, a reciprocatory sleeve carried by said supportinv ranged t envelopel the' dr pneumatic 'hammer a central nail -guide internally positioned -in sleeve, a nail feeding hopper carried by sai supporting structure, a nail delivery conduit vextending between said nail feeding hopper and the central nail guide" of .said reciprocatory sleeve, a longitudinally extending rod secu-red to said reciprocatorylsleeve and arranged to be moved longitudinally of said pneumatic hammer for effecting the -selection and delivery cfa nail from said nail feeding hopper to said nail delivery conduit, and a valve controlled by themovement of air under pressure to periodicall guide for te driving operation of said pneumatic hammer.

3. A nail'driving attachment for pneumatic hammers comprising a structure arsaid reciprocator secured over a pneuranged to be secured over the body -of a f pneumatic hammer,

pressed reciprocatory sleeve arranged to-envelope the 'driving head of said.

pneumatic hammer, a central' nail guide internalflly ositi'oned within Said sleeve, a stud carrie y said structure, la. cam member mounted to rotate on said stud, a nail feeding hopper supported on said structure, ,a bell crank arranged to i cam, a nail selection device carried by said bell crank and arrangedto bemoved beneath said nail feeding hopper a nailconve ing conduit supportedA by said structure an extending to said central nail guide, a valve for admitting compressed air to said nail conveying conduit, and a longitudinally extending actuator'arranged to mve simultaneousl catory s eeve for operatingsaid cam and effecting a selection and delivery of a nail into said nail conveying conduit and subsequently -controlling `sald valve for admitting compressed air to said conduit for blowing a nail mtcsaidcentiral nail operatin of said pneumatic hammer.

In testimony whereof I aix my signature.

be 'moved by saidl anv with thevmotion-of said recipro-' guide for the driving 

